Line Qualification

Defect Containment

Equipment drift and feeder calibration errors introduce consistent placement offsets during prolonged circuit board fabrication cycles. Statistical process control charts track centroid deviation values from test coupon scans to catch mechanical wear before bridges occur. Manual visual inspection under high magnification verifies fine pitch lead coplanarity when automated machines flag borderline solder fillet formations.

Operator intervention prevents batch contamination by isolating faulty reels prior to multi-layer reflow exposure.

Acceptance Boundary

Final acceptance depends strictly on electrical test yield metrics and mechanical stress endurance tests conducted on sample printed circuit boards. Thermal shock cycling validates solder joint fatigue resistance under simulated field conditions without exceeding maximum allowable component stress limits. Qualification status expires automatically when core placement heads undergo major maintenance or software updates alter the baseline coordinate map.

Production supervisors must reauthorize the manufacturing cell through a full verification run before commercial shipment resumes.